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The flora and fauna of the ridge seem more closely related to the Tennessee hills to the east than to the Ozark Mountains to the west. This unique habitat has been protected by the establishment of several state and city parks, the St. Francis National Forest, recreational lakes, and in 1997 a national scenic byway, the Crowley's Ridge Parkway.
The Marianna Fault is a fault located in the Crowley's Ridge area west of Marianna in eastern Arkansas. [citation needed] The discovery was first announced by seismologists on January 21, 2009. It is separate from the New Madrid seismic zone, [1] which is 100 kilometers (62 mi) to the east. [2]
Crowley's Ridge State Park is a 291-acre (118 ha) Arkansas state park in Greene County, Arkansas in the United States atop Crowley's Ridge.Located on the former homesite of pioneer Benjamin Crowley, the park contains many excellent examples of the work done by the Civilian Conservation Corps in the 1930s. [1]
Arkansas's regions are defined using many different criteria. Distinct natural regions of Arkansas include The Ozarks, Ouachita Mountains, Arkansas River Valley, Gulf Coastal Plain, Crowley's Ridge, the Arkansas Delta, Arkansas Timberlands, and Central Arkansas. Arkansans usually identify as being from one of five regions: northwest, southwest ...
The flat plain is bisected by Crowley's Ridge, a narrow band of rolling hills rising 250 to 500 feet (76 to 152 m) above the flat delta plains. Several towns and cities have been developed along Crowley's Ridge, including Jonesboro. [3] The region's lower western border follows the Arkansas River just outside Little Rock down through Pine Bluff.
Periodic extensive glacial outwash from the Ohio River and Mississippi River produced Crowley's Ridge and both the Eastern Lowlands and Western Lowlands. Silt and sand formed loess and dunes. During the last 11,000 years of the Holocene , Arkansas has experienced additional deposition of alluvium due to Mississippi River floods.
Crowley's Ridge, the only portion of the Bluff Hills (74a) ecoregion in Arkansas, is a disjunct series of loess-capped hills surrounded by the lower, flatter Mississippi Alluvial Plain (73). Crowley's Ridge, with elevations of up to 500 feet (150 m), is of sufficient height to have trapped wind-blown silt during the Pleistocene Epoch.
It is theorized that Crowley's Ridge in Arkansas was part of the Chickasaw Bluff formation before the previous ice age when the prehistoric courses of the Ohio River and Mississippi River carved a path between the two. Crowley's Ridge has the same composition as the Chickasaw Bluffs and has similar topography.